Mix all the dry goods with a fork, then use a pastry cutter to cut in the margarine.

Take all the wet goods and mix them up (in a blender? But I'm sure you could do this with a fork as well, just make sure the egg is broken up good). Add the wet to the flour mix and stir until blended. Pour it into a pan and spread it with a spatula.

Top with fruit and additional crumb topping (made as above). Bake at 375 F for roughly 50 minutes.